RSpec error with expecting DateTime value to be_within a duration of a ActiveSupport::TimeWithZone value

Why does the following test give me a TypeError: expected numeric error:

RSpec error with expecting DateTime value to be_within a duration of a ActiveSupport::TimeWithZone value

Why does the following test give me a TypeError: expected numeric error:

RSpec error with expecting DateTime value to be_within a duration of a ActiveSupport::TimeWithZone value

Why does the following test give me a TypeError: expected numeric error:

RSpec error with expecting DateTime value to be_within a duration of a ActiveSupport::TimeWithZone value

Why does the following test give me a TypeError: expected numeric error: